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google-175365-best-practices-for-forwarding-email-to-gmail.txt
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google-175365-best-practices-for-forwarding-email-to-gmail.txt
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• Import & forward emails
• Best practices for forwarding email to Gmail
Best practices for forwarding email to Gmail
This article has recommendations for email administrators and Gmail users who
forward messages from other accounts or services to Gmail. Forwarding email
messages can affect email authentication. Follow the recommendations in this
article to increase the likelihood that forwarded messages pass authentication
and are delivered as expected.
Email administrators: If you’re an email administrator who forwards email to
Gmail from other servers or services, take steps to ensure Gmail correctly
marks forwarded messages as legitimate or spam. Follow our recommendations in
the section Email forwarding for administrators.
Email senders: We always recommend that senders set up SPF and DKIM
authentication. For forwarded messages, DKIM authentication is especially
important to help ensure your email is delivered as expected. Learn more
Gmail users: If you forward messages from a non-Gmail account to your Gmail
account, follow our recommendations in the section Email forwarding for Gmail
users.
Email forwarding for administrators & senders
If you manage email for your organization and you forward email from other
servers or services to Gmail, follow the recommendations in this section to
ensure email is delivered as expected.
Help prevent forwarded messages from being marked as spam
These practices help ensure messages forwarded to Gmail pass SPF
authentication, reducing the likelihood that Gmail marks messages as spam:
• Change the envelope sender to reference your forwarding domain.
• Make sure your domain's SPF record includes the IP addresses or domains of
all servers or services that forward email for your domain.
• Use third-party products or services to identify spam messages, and prevent
them from being forwarded. If forwarded messages from your domain are
marked as spam by recipients, future messages from your domain are more
likely to be marked as spam.
• Consider using a unique domain or IP address to forward messages. This is
one of our recommendations for preventing email to Gmail users from being
blocked or sent to spam.
Help forwarded messages pass authentication
• Set up SPF and DKIM email authentication: We recommend email administrators
always set up SPF and DKIM email authentication for their domain. Email
forwarding can affect message authentication, and forwarded messages often
fail SPF authentication. This is why we recommend you always set up DKIM
authentication, along with SPF, to help ensure your messages are
authenticated and delivered as expected.
• Avoid breaking DKIM authentication: Messages that don't pass DKIM are more
likely to be sent to spam. Changes to message contents can cause messages
to fail DKIM authentication. Avoid changing the body and message headers
protected by DKIM. For messages sent from frequently spoofed domains, Gmail
enforces strict authentication requirements. The following actions can
cause forwarded messages to fail DKIM:
□ Modifying the MIME boundaries
□ Modifying the message Subject
□ Third-party software modifying the body of the message (including
re-encoding the message)
□ Expanding message recipients with LDAP
□ Modifying the Subject and other headers protected by the DKIM signing
domain (including To, Cc, Date, and Message-ID)
• Add ARC headers: To reduce the likelihood that forwarded messages are
rejected or marked as spam, we recommend you add ARC headers to forwarded
messages. ARC verifies previous authentication checks for forwarded
messages, and helps ensure forwarded messages are delivered to the final
recipients. Learn more about ARC.
• Add forwarding headers: To let email servers know that a message is
forwarded, add an X-Forwarded-For: or X-Forwarded-To: message header.
Receiving servers manage forwarded messages differently than direct,
incoming messages.
Email forwarding for Gmail users
If you forward messages from other email accounts to your personal Gmail
account, follow the recommendations in this section to help ensure messages are
delivered correctly:
• Set up IMAP or POP in your Gmail account: IMAP lets you read messages on
multiple devices, and messages are synced in real time. POP lets you get
messages on a single device, and messages aren't synced in real time.
Instead, they're downloaded and you decide how often you want to download
new emails. For detailed steps to set up IMAP or POP with your Gmail
account, visit Check emails from other accounts.
• Mark or unmark spam messages: When Gmail incorrectly marks a message as
spam or phishing, fix the mistake by following the steps in mark or unmark
messages as spam. This helps Gmail correctly identify spam and legitimate
messages in the future.
• Update your Gmail settings: If you forward messages from another email
account to your Gmail account, Gmail might incorrectly mark some messages
as spam or phishing. To help prevent this, add your non-Gmail address to
Gmail’s Send mail as setting. For detailed steps, visit Send emails from a
different address or alias.